Hello, anyone familiar with this system? I just ordered some sanding discs and thought they were going to be 6 hole 6", but they sent me the Clean Sand discs. Then they told me they could be used on an ordinary pad. I think that's a lot of crap. How would that work? They look like they're made to be used with the Clean Sand pads. And it's really hard to get some decent straight information about them. The picture in the catalog was for the 6 hole hookit. It doesn't make sense. Come on 3M, put some information out there, especially some that makes sense.